Omaha city, E Nebraska 68108; pop. 335,795.Oman independent sultanate, SE Arabia; 120,000 sq. mi.; pop. 1,400,000; cap. Muscat.Omsk city, S Russia; pop. 1,028,000.Ontario city, SW California 91760*; pop. 133,179.— prov., SE Canada; 344,090 sq. mi.; pop. 8,264,465; ...